Electronic structure of polyacetylene: Optical and infrared studies of undoped semiconducting and heavily doped metallic
- 15 August 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 20 (4), 1589-1602
- https://doi.org/10.1103/physrevb.20.1589
Abstract
The band structure and electronic properties of pure and heavily doped polyacetylene (both as grown and stretch oriented) have been investigated by a combination of optical-absorption and -reflection measurements in the frequency range from the middle ir (0.1 eV) through the visible (4.0 eV). The absorption data are consistent with a direct gap of approximately 1.4 eV in the trans-. A Kramers-Kronig analysis of the reflection data has been carried out to obtain and . We find that for the undoped semiconducting polymer, the strong transition observed in the visible exhausts the oscillator strength sum rule for electrons consistent with an interband transition. The frequency-dependent conductivity obtained from Kramers-Kronig analysis of the metallic polymer reflection data suggests "interrupted-strand" behavior. Application of effective-medium theory implies an intrinsic dc conductivity for metallic of . The measured dc values have thus far been limited by the low-density fibril morphology.
Keywords
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